000015702 001__ 15702
000015702 005__ 20161115135327.0
000015702 04107 $$aeng
000015702 046__ $$k2013-06-12
000015702 100__ $$aChancellor, B.
000015702 24500 $$aSeismic Response of Post-Tensioned Steel Rocking Concentrically Braced Frames With Various Aspect Ratios

000015702 24630 $$n34.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000015702 260__ $$bNational Technical University of Athens, 2013
000015702 506__ $$arestricted
000015702 520__ $$2eng$$aPost-tensioned, steel, rocking concentrically braced frames (also known as selfcentering concentrically braced frames or SC-CBFs) are a new type of seismic lateral force resisting system that reduces or eliminates the damage and residual drift often associated with conventional concentrically-braced frames (CBFs) under design level earthquakes. The SC-CBF is made up of a CBF whose column bases are not anchored to the foundation (they are free to uplift), post-tensioning steel that runs vertically over the height of the SC-CBF to prestress the SC-CBF to the foundation and some sort of energy dissipation device. The SCCBF eliminates the damage to the CBF members under design level earthquakes by limiting the base overturning moment that can develop and then keeping the members nominally elastic. The maximum base overturning moment is limited by allowing the SC-CBF to rock on its foundation and yielding of the post-tensioning steel. The residual drift is reduced or eliminated under design level earthquakes by a prestressing force from the post-tensioning steel running vertically over the height of the SC-CBF. The prestressing force provides a restoring overturning moment that returns the SC-CBF to its original undisplaced state after the earthquake. One of the key aspects and assumptions of the SC-CBF system is that the member forces are controlled by limiting the base overturning moment that can develop. Generally, base overturning moment is considered to be a first mode response, but as the aspect ratio increases this assumption becomes less valid. This means that the member forces may not be as well controlled as thought by limiting the base overturning moment. This paper studies the seismic response of six SC-CBFs across a range of aspect ratios through nonlinear time-history analysis and shows how the performance of the SC-CBF changes with aspect ratio.

000015702 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015702 653__ $$aSelf-Centering, Rocking, Steel, Concentrically-Braced Frames.

000015702 7112_ $$aCOMPDYN 2013 - 4th International Thematic Conference$$cIsland of Kos (GR)$$d2013-06-12 / 2013-06-14$$gCOMPDYN2013
000015702 720__ $$aChancellor, B.$$iSause, R.$$iRicles, J.$$iTahmasebi, E.$$iAkbas, T.
000015702 8560_ $$ffischerc@itam.cas.cz
000015702 8564_ $$s920411$$uhttps://invenio.itam.cas.cz/record/15702/files/1290.pdf$$yOriginal version of the author's contribution as presented on CD, section: CD-MS 40 STRUCTURAL DYNAMICS AND EARTHQUAKE ENGINEERING OF ROCKING STRUCTURES
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000015702 962__ $$r15525
000015702 980__ $$aPAPER